EP 1557031 B1 20110119 - TECHNIQUES OF IMPERCEPTIBLY ALTERING THE SPECTRUM OF A DISPLAYED IMAGE IN A MANNER THAT DISCOURAGES COPYING
Title (en)
TECHNIQUES OF IMPERCEPTIBLY ALTERING THE SPECTRUM OF A DISPLAYED IMAGE IN A MANNER THAT DISCOURAGES COPYING
Title (de)
TECHNIKEN ZUR UNWAHRNEHMBAREN VERÄNDERUNG DES SPEKTRUMS EINES ANGEZEIGTEN BILDES AUF EINE DAS KOPIEREN ABSCHRECKENDE WEISE
Title (fr)
TECHNIQUES PERMETTANT D'ALTERER IMPERCEPTIBLEMENT LE SPECTRE D'UNE IMAGE AFFICHEE DE MANIERE A DISSUADER LA COPIE
Publication
Application
Priority
- US 0334116 W 20031027
- US 28240402 A 20021028
Abstract (en)
[origin: US2004081318A1] Copying of visual images by electronic devices is discouraged by metamerically altering the relative weights of the color components forming the visual images in a manner that is not perceptible to the human eye but which is perceptible in the copy. In a preferred technique, the visual images are represented by more than three primary color components whose relative values are varied in this manner. A primary application is to discourage copying by video cameras of movies displayed on theater movie screens, by causing the copies to contain unacceptable spatial or temporal variations in colors perceived by the human eye.
IPC 8 full level
H04N 1/00 (2006.01); H04N 5/913 (2006.01)
CPC (source: EP KR US)
H04L 9/00 (2013.01 - KR); H04N 5/913 (2013.01 - EP US); H04N 21/835 (2013.01 - KR); H04N 2005/91392 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2004081318 A1 20040429; US 7386125 B2 20080610; AT E496482 T1 20110215; AU 2003287229 A1 20040525; AU 2003287229 A8 20040525; CA 2503835 A1 20040513; CA 2503835 C 20131231; DE 60335818 D1 20110303; EP 1557031 A2 20050727; EP 1557031 A4 20060705; EP 1557031 B1 20110119; JP 2006505191 A 20060209; JP 4545592 B2 20100915; KR 101036840 B1 20110525; KR 20050087789 A 20050831; US 2008187247 A1 20080807; US 7747015 B2 20100629; WO 2004040899 A2 20040513; WO 2004040899 A3 20040819
DOCDB simple family (application)
US 28240402 A 20021028; AT 03781410 T 20031027; AU 2003287229 A 20031027; CA 2503835 A 20031027; DE 60335818 T 20031027; EP 03781410 A 20031027; JP 2004548514 A 20031027; KR 20057007393 A 20031027; US 0334116 W 20031027; US 9925608 A 20080408